The request "api" is too broad to name one product, so the answer lists API platforms that serve different needs: email delivery, webhooks, exchange rates, security scanning, and an API directory. The best fit depends on the job, and the question below asks which one.
A question back: What do you want the API to do, for example send email, scan security, look up exchange rates, or find an API for a task?
- 1
SendGrid Email APItwilio.comverified and signed
A cloud email API for sending transactional and marketing email at scale, with an API Email Activity beta exposed as an official door 111.
official:API · Email Activity (beta)+13 community tools built for it
for agents: API · GET_api_keys · GET_api_keys-api_key_id
- 2
Svixsvix.comverified and signed
A webhook platform for sending and receiving webhooks with retries and signature verification, exposed through create endpoint, integration and application actions 919.
for agents: create_endpoint_api_v1_app__app_id__endpoint__post · create_integration_api_v1_app__app_id__integration__post · create_application_api_v1_app__post
- 3
Gemini Developer APIgoogle.comverified and signed
Google's API for building with Gemini and Gemma models through Google AI Studio, with agent and live-API skills available for it 1020.
official:SDK · @google/gemini-clirepository · sec-geminiskill · gemini-agents-apiskill · gemini-apiskill · gemini-interactions-api
for agents: gemini-api · gemini-interactions-api · gemini-live-api
- 4
- 5
Rate-APIrate-api.comwebsite read, tools not yet checked
An exchange rate API covering 160+ currencies with conversion, historical data and crypto, using simple key authentication 7.
- 6
middleBrickmiddlebrick.comfound in code, not yet checked
A security scanner that gives a quantified risk score for an API endpoint through its scan_api and list_scans actions 2.
+1 community tools built for it
for agents: scan_api · scan_api · list_scans
Sources
- 1SendGrid Email API and Email Marketing Campaigns | Twiliotwilio.com · read 2026-10-29
- 2Scan Any API. Security Score in 60 Seconds, Zero Setup | middleBrickmiddlebrick.com · read 2026-10-29
- 5Replicate - Run AI with an APIreplicate.com · read 2026-10-29
- 7Rate-API — Free Exchange Rate API for 160+ Currenciesrate-api.com · read 2026-10-29
- 9Webhooks as a Service – Secure and Enterprise Ready · Svixsvix.com · read 2026-10-29
- 10Gemini Developer API | Gemma open models | Google AI for Developersai.google.dev · read 2026-10-29
- 11python-http-client: declares "API" (the record we read and signed)unfragile.ai · read 2026-10-24
- 15pixray/api: declares "pixray/api" (the record we read and signed)unfragile.ai · read 2026-10-24
- 19Svix API: declares "create_endpoint_api_v1_app__app_id__endpoint__post" (the record we read and signed)unfragile.ai · read 2026-10-24
- 20gemini-api: declares "gemini-api" (the record we read and signed)unfragile.ai · read 2026-10-24
For agents: the 10 actions behind this answer
API · python-http-client verified and signed
scan_api · middleBrick found in code, not yet checked
Scan an API endpoint for security vulnerabilities and get a risk score
getAPI · APIs.guru verified and signed
Retrieve one version of a particular API
· API Market website read, tools not yet checked
API Marketplace trusted by 18,800+ developers, where you can buy and sell APIs. Discover Flight APIs, Face Swap, Text-to-Video APIs, marketing automation tools, integrations, and more!
pixray/api · pixray/api verified and signed
bare pixray for API use
mrhan1993/fooocus-api · mrhan1993/fooocus-api verified and signed
Search the API catalog · APIs.io verified and signed
Federated search across API providers, APIs and tags in one call, with match counts. Filter by tag, artifact type, industry, region or rating band. Free, no key required. e.g. Find payment APIs with an OpenAPI and an MCP server e.g. Which providers in insurance publish machine-readable rate limits?
· Rate-API website read, tools not yet checked
Exchange rate API for 160+ currencies, checked hourly, with conversion, historical data and crypto. Free tier, simple key auth, JSON/XML/CSV.
· Rapidapi website read, tools not yet checked
Explore your APIs
create_endpoint_api_v1_app__app_id__endpoint__post · Svix API verified and signed
Create Endpoint
Labels are the instruments' verdict and are never changed by ranking. Agents and robots get this same answer as JSON at /api/v1/find?q=…&answer=1 and through the MCP server.